Attention: TDR Forum Junkies 
Well i finally got rid of the drone i've always had with the MBRP duals, even with the resonator running the SPS62 the drone was unbearable, and the exhaust note was really loud.
So after searching and searching i ordered a straight thru Walker 21838 40" x 8" muffler 60 bucks from rock auto, i installed it directly to the inlet of the MBRP muffler.
The truck is quiet but still has a deep rumble at full throttle, no change in power or egt's and best of all NO drone at any rpm, in fact you can hear nothing from the exhaust in the cab at all.
So after searching and searching i ordered a straight thru Walker 21838 40" x 8" muffler 60 bucks from rock auto, i installed it directly to the inlet of the MBRP muffler.
The truck is quiet but still has a deep rumble at full throttle, no change in power or egt's and best of all NO drone at any rpm, in fact you can hear nothing from the exhaust in the cab at all.
